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Cu of serum of (0.52 ± 0.08)‰. The model also predicts that the isotopic composition of the tri-nuclear binding motif of ceruloplasmin may be relatively depleted in the lighter isotope of Cu compared to the other copper binding sites by as much as -1.08 ± 0.45‰.
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Tennant et al. (2017) studied this question.
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